Change-proposals: Difference between self contained and systemwide changes?

I could not find explanations about the differences.

What makes a change systemwide? A package that is integrated in multiple variants? Or used by multiple components?

from Changes policy :: Fedora Docs

System-Wide Changes

System-wide changes involve system-wide defaults, critical path components, or other changes that are not eligible as self-contained changes. Promoting a deliverable to Edition status is a System-Wide Change by Council policy.

For a comparison to Self-Contained Changes, refer to: Changes policy :: Fedora Docs

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